City Defence - Did I miss something?

[BufordTJustice]

At the moment I am leading a war against China in a learning game and I noticed a strange thing about the city defence. I am attacking the capital Shanghai. The city defence value was 100% and when I attack with trebs they will remove 4%, cats will remove 2%. What is it that makes this city so strong?

Furthermore, I noticed that the city defence value changes when I click on a stack different from my attack stack. See the two screenshots. In one case the attack steck is selecteed -> defence value of Shanghai: 78%
In the next case I selected he galleon -> defence value for Shanghai: 31%

I can't explain this strange behaviour... Help is really appreciated!

 

[TheLazyHase]

There is a castle in the city, so bombardment is at -75% and there is a strength boni against non-gunpowder unit, and galleon are gunpowder unit in this case.

 

[BufordTJustice]

There is a castle in the city, so bombardment is at -75% and there is a strength boni against non-gunpowder unit, and galleon are gunpowder unit in this case.

Oh, thanks! I did not know that this is actually reflected in the defence value! Seems it was a bad idea to siege this city... What could I do? Bring in a spy? I have one on the way...

 

[banson]

well you could bring more seige to help kill the city def value quiker.. u definitely want to take away the 100 value they got. and seige is made to take a little off the top so u dont have any uber ancient weapons.. now destroyers and battle ships doing 20% is nice